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Windows 7: Unable to create new system partition to install Win 7 64bit

I've been playing around with installing windows 7 64bit now for about 7hrs and getting nowhere.

I got a new Lenovo Y50 with windows 8.1 and hate the OS so I got a copy of win 7 pro to install instead.

There is no optical drive so I'm using a usb drive created with rufus and the windows 7 pro iso file.

Initially I had the missing drivers error for a few hours but tried a new installer iso and then rufus and it worked fine.

Then I got the selecting drives and removed all the old win 8 partitions until I had just one unallocated block of space which I created into the primary partition. But it won't let me install onto it...

Now I can't get the damn installer to recognize the drive or create a new partition.

I've used the diskpart method at least 100 times cleaned, recreated primary partition, assigned it, made it active, everything from all the tutorials...and then also tried GParted recently which is much easier. Each time both methods seem to work fine, and when I get to the installer I can see the partitions but as soon as I click next to install to that partition i get the error "Setup was unable to create a new system partition or locate an existing system partition. See the setup log file for more information."

I have secure boot disabled in bios, I have the legacy support enabled and usb boot enabled. The usb drive is #1 on the boot order and the SSD is next.

What else can I do at this point!!! I'm going crazy here! I have a brand new computer that's essentially a paperweight...cause I can't get this damn win 7 loaded.

How about your choices to Reset BIOS to Defaults? Is there another to Reset to Other OS defaults? Anything similar?

Go ahead an Reset to Defaults and observe where CSM, Legacy and Secure Boot are then. Disable Secure Boot but leave the other and see if you can boot your Rufus-created installation stick as a UEFI device, again deleting all partitions. Sometimes EFI actually works better since that's the way things are going. I am using it now on my Lenovo laptop. I also had to Reset to Other OS defaults to install Win7.

I know it's to late now, but ... with very little effort, Windows 8.1 can be made to look and feel like Windows 7 by installing Classic Shell or Start8 (or other similar Start Menu enhancers). No need to downgrade (some would say upgrade) to Windows 7.

I run Windows 8.1 and never see the Modern Desktop or Apps. I'm strictly a Desktop user.

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